Why Is the Criticism That Shaw and McKay Relied on Police

Why is the criticism that Shaw and McKay relied on police records to calculate neighbourhood crime rates so important?

A) High crime rate zones will naturally have high arrest rates.
B) A zone's high crime rate may be more a function of police practices and not a measure of actual crime rates.
C) Chicago police department records are not open to public inspection and thus modern researchers cannot replicate the research.
D) The dark figure of crime is not present in arrest records.